21.4.3 Frame Format

The TPI physical layer supports a fixed frame format. A frame consists of one character, eight bits in length, and one start bit, a parity bit and two stop bits. Data is transferred with the least significant bit first.

Figure 21-3. Serial frame format.
Symbols used in the above figure:
  • ST: Start bit (always low)
  • D0-D7: Data bits (least significant bit sent first)
  • P: Parity bit (using even parity)
  • SP1: Stop bit 1 (always high)
  • SP2: Stop bit 2 (always high)